Undefined index: instance in addressfield_format_address_hide_country

When generating tokens for an addressfield that has the country hidden set as an option, the only data provided is the mode:

Line 140 in addressfield.tokens.inc:

 $form = addressfield_generate($address, $data['format_handlers'], array('mode' => 'form'));

However, the module wants more information:

function addressfield_format_address_hide_country(&$format, $address, $context = array()) {
  // Hide the country element only if the whole field is required, otherwise
  // there will always be an additional None option.
  if ($context['mode'] == 'form' && $context['instance']['required']) {

So if instance isn't provided, it throws a notice.